Strange Old Disk, I think I got it!

From: Tony Duell <>
Date: Wed Mar 3 18:01:51 2004

> light because of the new information. But it compared 2280 and CDC 9448 =


> I would like some input on that conclusion though because I couldn't =
> find any pictures to help confirm it. Also, and I'll be doing more =
> searching for more info as well, but I still don't know what size these =
> are, or if they even have a standard size for that drive, so any input =

I have a CDC9448. I also have the technical manual for it.

The platters are 14" diameter (or thereabouts). There's a removeable pack
(cartridge) containing 1 platter and 3 fixed platters built into the
drive. Each data surface stores 16 Mbuytes. The removeable pack has 1
data surface and one servo surface (used for positioning the heads), the
fixed platters have 5 data surfaces and 1 servo surface. The drive uses
the appropriate servo surface depending on whether your accessing a fixed
or remvoeable data surface, thus eliminating problems caused by slight
'run out' between the fixed and removeable platters. The total capacity
of the drive is therefore 96 Mbytes.

Received on Wed Mar 03 2004 - 18:01:51 GMT

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